Three pages & no mention of Riker's penchant for trying to ram through doors with his forehead (or, from S5 on, fivehead)? Tch.

That is what he does when he has something very, very serious to pursue. Sometimes he has to go into the Ready Room to talk Picard out of an away mission, or express displeasure about a female or transporter twin competitor. Sometimes he is pursuing an alien hottie. Sometimes he is just confused.